components: Add out-of-line copy ctors for complex classes.

components/sync_driver/data_type_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync_driver/data_type_manager.h"
 
 namespace sync_driver {
 
 DataTypeManager::ConfigureResult::ConfigureResult()
     : status(UNKNOWN) {
 }
 
 DataTypeManager::ConfigureResult::ConfigureResult(
     ConfigureStatus status,
     syncer::ModelTypeSet requested_types)
     : status(status), requested_types(requested_types) {
 }
 
+DataTypeManager::ConfigureResult::ConfigureResult(
+    const ConfigureResult& other) = default;
+
 DataTypeManager::ConfigureResult::~ConfigureResult() {
 }
 
 // Static.
 std::string DataTypeManager::ConfigureStatusToString(ConfigureStatus status) {
   switch (status) {
     case OK:
       return "Ok";
     case ABORTED:
       return "Aborted";
     case UNRECOVERABLE_ERROR:
       return "Unrecoverable Error";
     case UNKNOWN:
       NOTREACHED();
       return std::string();
   }
   return std::string();
 }
 
 }  // namespace sync_driver